Update app.py

app.py

@@ -4,6 +4,11 @@ import tempfile
 import os
 import time
 import sys
+import logging
+
+# Set up logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
 
 # Check for required dependencies
 try:
@@ -14,6 +19,40 @@ except ImportError as e:
     print("Please install requirements: pip install gradio skidl")
     sys.exit(1)
 
+# Check KiCad symbol directory environment variables
+def check_kicad_env():
+    """Check if KiCad symbol directory environment variables are set."""
+    kicad_vars = [
+        'KICAD_SYMBOL_DIR',
+        'KICAD6_SYMBOL_DIR',
+        'KICAD7_SYMBOL_DIR',
+        'KICAD8_SYMBOL_DIR'
+    ]
+    missing = [var for var in kicad_vars if not os.environ.get(var)]
+    if missing:
+        logger.warning(
+            f"Missing KiCad environment variables: {', '.join(missing)}. "
+            "Set these to access default KiCad symbol libraries."
+        )
+        return False
+    return True
+
+# Set default symbol library path if not set
+def set_default_symbol_lib():
+    """Set a fallback symbol library path if environment variables are missing."""
+    if not check_kicad_env():
+        # Use a generic library or custom path (modify as needed)
+        default_lib_path = os.path.expanduser("~/kicad_symbols")  # Example path
+        if os.path.exists(default_lib_path):
+            os.environ['KICAD_SYMBOL_DIR'] = default_lib_path
+            lib_search_paths.append(default_lib_path)
+            logger.info(f"Set default symbol library path: {default_lib_path}")
+        else:
+            logger.warning(
+                f"Default symbol library path {default_lib_path} not found. "
+                "Parts may not be resolved without valid libraries."
+            )
+
 def cleanup_old_files():
     """Clean up temporary files older than 1 hour."""
     temp_dir = tempfile.gettempdir()
@@ -33,6 +72,9 @@ def generate_circuit(skidl_code):
     reset()  # Reset SKiDL state
     tmp_path = None
     try:
+        # Set default symbol library if needed
+        set_default_symbol_lib()
+
         # Validate code syntax
         try:
             compile(skidl_code, '<string>', 'exec')
@@ -74,15 +116,23 @@ def generate_circuit(skidl_code):
 
 # Gradio UI
 with gr.Blocks() as demo:
-    gr.Markdown("# SKiDL Circuit Builder (No KiCad Needed)")
+    gr.Markdown(
+        """
+        # SKiDL Circuit Builder (No KiCad Needed)
+        **Note**: Ensure KiCad symbol libraries are accessible by setting `KICAD_SYMBOL_DIR` or other relevant environment variables.
+        """
+    )
     
-    # Example code for placeholder
+    # Example code with explicit library (Device library for basic components)
     example_code = """
 from skidl import *
+# Use Device library for basic components
+lib_search_paths.append('.')  # Ensure local libraries are searchable
+set_default_lib('Device')  # Use built-in Device library
 vcc = Vcc()
 gnd = Gnd()
-r1 = Part('R', 'R', value='1k')
-c1 = Part('C', 'C', value='1uF')
+r1 = Part('Device', 'R', value='1k')  # Explicitly use Device library
+c1 = Part('Device', 'C', value='1uF')
 r1[1] & c1 & gnd
 r1[2] & vcc
 """